First off, this is a really gorgeous piece, and we're using it as an analysis piece over at /r/MLPDrawingSchool (also mlpdrawingschool here on dA). It's particularly excellent to look at to show composition. Nice work!

That said, you asked for critique, so let me see. I'll do a mix of the good and the bad; most of the flaws are simply minor things that only really bugged me on second viewing:

The Good:

- Excellent balance, both up and down and left to right. The focus is properly on Chrysalis first and foremost, but flows out along the swarm and loops back around through the egg... sac... thingy and back up to the queen, floating around the empty view of the horizon.

- The ground has a phenomenal sense of texture, as does Chrysalis herself. The contrast between sections with high texture and those without is very well done.

- The color is nicely unified across the piece as a whole, for the most part (see next section).

- Variety! All over the place, making the piece very interesting to look at. Lots of "cookies" for the viewer.

The Less Than Perfect:

- Chrysalis's horn contrasts with the rest of her; it lacks the texture and specularity of the rest of her hide. It adds to the composition by drawing attention to it, but this could have been achieved without seem not-a-part of Chrysalis.

- Chrysalis's wings, particular in terms of their saturated turquoise color, unbalance the piece somewhat, trapping the eye just a bit too much. Keeping the eye on Chrysalis does serve the overall composition, but I might consider pushing them back just a touch, particularly the far wing.

I love everything about this. I love the coloring; it makes the Changelings seem like some sort of pestilence sweeping across Equestria, leaving barren wasteland wherever they travel. The scene is phenomenal; thousands of Changelings swarming across the barren landscape with Queen Chrysalis leading them, draining the the last of love from some poor soul that has been encased in amber.

This seems like the more natural form that the Changelings should have taken; they seem like a mix between dead, twisted ash trees, moss and insects; much more scary and appropriate than than black ponies filled with holes. I get that it's a kids show, but really. They looked like they were made of black cheese.

I've loved all your pony art, from the shot of Discord, Celestia and Luna to the one of the adventures of Trixie. But this is by far my favorite.

Umm. Question for Queen Chrysalis. what do you want brat? If my brothers love for Cadence was strong enough to give you more power than Celestia, then why didn't you realize that Cadences love for my brother would be strong enough to give him the strength to cast you out of Equestria? Shut up! That's why!

I have absolutely no words, this is just epic at the power of infunity. SO LOVE IT !!!!!!!!!!!! I can just imagine how hard you worked at it. MY RESPECTS !!!!!!Also I like how you draw the changelings, especially Chrysalis, really showing there insectoidal nature and that they really HAVE a proper exoskeleton.

I can tell you were inspired by the Zurg/Tyranids, the way that I see it is that Crysalis is like the Overmind of the changeling swarm, and the alicorn in the cocoon is like the Kerrigan from the starcraft universe, the young alicorn could have had some unique properties that Crysalis would like to incorporate into the swarm, or even yet she saw untapped power within the young pony and kidnapped and mutated it into a powerful heir to the swarm, and will later live on to take command of the swarm one day, just like Kerrigan did, thats my take on it, but overall an awesome piece of art, I love how your art has a story, and you leave it up to the viewer to make their own versions of what they think, well done.

Chrysalis attempted to ascend to Alicorn status from her origins as a flutterpony. Unfortunately, at the time, the elements of harmony hadn't been discovered yet, so she became the princess of cheese (hence the holes).

This caused her to go all emo. So she got an H.R. Giger makeover and brainwashed her subjects with endless reruns of reality TV shows until they lost their souls. The rest is history.